Drive circuit
US8248325B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2012 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Mar 20, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0626
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A plurality of resistive paths are coupled in parallel to a common node. A high side driver is operable responsive to first control signals to selectively supply current to certain ones of the resistive paths. A low side driver, including a plurality of selectively actuated current sink paths, is provided to sink current from the common node. A control logic circuit actuates a current sink path within the low side driver for each resistive path that is selectively supplied current by the high side driver. A substantially constant low side voltage drop through these sink paths is provided regardless of the number of resistive paths that are supplied current by the high side driver. A switched high side and low side configuration operating in an analogous way is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.